A good (and entertaining) primer on revolutions is the now completed Revolutions podcast. I think you'll find revolutions more complex than that simplistic characterization. Most violence in a revolution happens during the counter revolution.

Raising the spectre of possible revolutionary violence ignores the violence of the current system. Can you imagine the world overcoming climate disaster, with all the carnage it will bring, while under the rule of capitalism? Any revolutionary violence should be compared against the ongoing and future violence of capitalism, and its interconnected systems of white supremacy and patriarchy.

Edit to add url for podcast: http://www.sal.wisc.edu/~jwp/revolutions-episode-index.html

https://podcasts.apple.com/us/podcast/revolutions/id703889772